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<p>In this study, CoCrFeNiCu-xTi(C, N) (wt.%, x = 10, 20, 30, 40) high-entropy alloy-based composite materials were fabricated via vacuum hot-pressing sintering, and the effects of Ti(C, N) content on the microstructure and mechanical properties of the composites were systematically investigated. Characterization results revealed that the composites primarily consisted of a face-centered cubic high-entropy alloy matrix phase and a Ti(C, N) ceramic reinforcement phase. The introduction of Ti(C, N) was found to enhance the hardness of the composites. With increasing the Ti(C, N) content, the relative density of the high-entropy alloy-based materials exhibited a slight decreasing trend, and bending strength was gradually reduced. The hardness of the samples increased initially and reached its maximum at 30&#xa0;wt.%Ti(C, N), followed by a decline at 40&#xa0;wt.%. The composite with the Ti(C, N) addition of 20&#xa0;wt.% exhibited the best comprehensive performance, with a hardness of 661.4&#xa0;HV and a bending strength of 1137&#xa0;MPa. The results indicated that Ti(C, N) improved the mechanical properties of the CoCrFeNiCu matrix primarily through dispersion strengthening and grain refinement/grain boundary strengthening mechanisms. By rationally controlling the Ti(C, N) content and its dispersion state, the mechanical performance of HEA-based composites could be effectively optimized.</p>

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Effect of Ti(C, N) Content on Mechanical Properties of CoCrFeNiCu/Ti(C, N) High Entropy Alloy Based Materials

  • 期刊论文

  • 发表日期：

    2026年7月3日

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  • Kai Zhang,
  • Changxia Liu,
  • Xudong Wei,
  • Junlong Sun,
  • Hua Zhang,
  • Haobin Sun

摘要

In this study, CoCrFeNiCu-xTi(C, N) (wt.%, x = 10, 20, 30, 40) high-entropy alloy-based composite materials were fabricated via vacuum hot-pressing sintering, and the effects of Ti(C, N) content on the microstructure and mechanical properties of the composites were systematically investigated. Characterization results revealed that the composites primarily consisted of a face-centered cubic high-entropy alloy matrix phase and a Ti(C, N) ceramic reinforcement phase. The introduction of Ti(C, N) was found to enhance the hardness of the composites. With increasing the Ti(C, N) content, the relative density of the high-entropy alloy-based materials exhibited a slight decreasing trend, and bending strength was gradually reduced. The hardness of the samples increased initially and reached its maximum at 30 wt.%Ti(C, N), followed by a decline at 40 wt.%. The composite with the Ti(C, N) addition of 20 wt.% exhibited the best comprehensive performance, with a hardness of 661.4 HV and a bending strength of 1137 MPa. The results indicated that Ti(C, N) improved the mechanical properties of the CoCrFeNiCu matrix primarily through dispersion strengthening and grain refinement/grain boundary strengthening mechanisms. By rationally controlling the Ti(C, N) content and its dispersion state, the mechanical performance of HEA-based composites could be effectively optimized.